var cal = null;
var isFocus = false; //是否为焦点
//function SelectDate(obj,strFormat) //两个参数改为只传一个
function SelectDate(obj, o, n) {
  var date = new Date();
  var by = date.getFullYear() - (typeof o == 'undefined' ? 10 : o); //最小值 → 10 年前
  var ey = date.getFullYear() + (typeof n == 'undefined' ? 10 : n); //最大值 → 10 年后
  if (cal == null) {//初始化为中文版，1为英文版
    cal = new Calendar(by, ey, 0);
  }
  else {
    cal.beginYear = by;
    cal.endYear = ey;
    cal.bindYear();
    //		cal.bindMonth();
    //		cal.changeSelect();
    //		cal.bindData();
  }
  //cal.dateFormatStyle = strFormat; // 默认显示格式为:yyyy-MM-dd ,还可显示 yyyy/MM/dd
  cal.show(obj);
}
/**//* 返回日期 */
String.prototype.toDate = function(style) {
  var y = this.substring(style.indexOf('y'), style.lastIndexOf('y') + 1);//年
  var m = this.substring(style.indexOf('M'), style.lastIndexOf('M') + 1);//月
  var d = this.substring(style.indexOf('d'), style.lastIndexOf('d') + 1);//日
  if (isNaN(y))
    y = new Date().getFullYear();
  if (isNaN(m))
    m = new Date().getMonth();
  if (isNaN(d))
    d = new Date().getDate();
  var dt;
  eval("dt = new Date('" + y + "', '" + (m - 1) + "','" + d + "')");
  return dt;
}
/**//* 格式化日期 */
Date.prototype.format = function(style) {
  var o = {
    "M+": this.getMonth() + 1, //month
    "d+": this.getDate(), //day
    "h+": this.getHours(), //hour
    "m+": this.getMinutes(), //minute
    "s+": this.getSeconds(), //second
    "w+": "天一二三四五六".charAt(this.getDay()), //week
    "q+": Math.floor((this.getMonth() + 3) / 3), //quarter
    "S": this.getMilliseconds() //millisecond
  }
  if (/(y+)/.test(style)) {
    style = style.replace(RegExp.$1,
            (this.getFullYear() + "").substr(4 - RegExp.$1.length));
  }
  for (var k in o) {
    if (new RegExp("(" + k + ")").test(style)) {
      style = style.replace(RegExp.$1,
              RegExp.$1.length == 1 ? o[k] :
              ("00" + o[k]).substr(("" + o[k]).length));
    }
  }
  return style;
}

/**//*
 * 日历类
 * @param   beginYear 1990
 * @param   endYear   2010
 * @param   lang      0(中文)|1(英语) 可自由扩充
 * @param   dateFormatStyle "yyyy-MM-dd";
 */
function Calendar(beginYear, endYear, lang, dateFormatStyle) {
  this.beginYear = 1990;
  this.endYear = 2010;
  this.lang = 0;            //0(中文) | 1(英文)
  this.dateFormatStyle = "yyyy-MM-dd";

  if (beginYear != null && endYear != null) {
    this.beginYear = beginYear;
    this.endYear = endYear;
  }
  if (lang != null)
    this.lang = lang

  if (dateFormatStyle != null)
    this.dateFormatStyle = dateFormatStyle

  this.dateControl = null;
  this.panel = this.getElementById("calendarPanel");
  this.container = this.getElementById("calendar_panel_wrap");
  this.form = null;

  this.date = new Date();
  this.year = this.date.getFullYear();
  this.month = this.date.getMonth();


  this.colors = {
    "cur_word": "#FFFFFF", //当日日期文字颜色
    "cur_bg": "#83A6F4", //当日日期单元格背影色
    "sel_bg": "#FFCCCC", //已被选择的日期单元格背影色
    "sun_word": "#FF0000", //星期天文字颜色
    "sat_word": "#0000FF", //星期六文字颜色
    "td_word_light": "#333333", //单元格文字颜色
    "td_word_dark": "#CCCCCC", //单元格文字暗色
    "td_bg_out": "#eeeeee", //单元格背影色
    "td_bg_over": "#FFCC00", //单元格背影色
    "tr_word": "#000000", //日历头文字颜色
    "tr_bg": "#dddddd", //日历头背影色
    "input_border": "#CCCCCC", //input控件的边框颜色
    "input_bg": "#eeeeee"   //input控件的背影色
  }

  this.draw();
  this.bindYear();
  this.bindMonth();
  this.changeSelect();
  this.bindData();
}

/**//*
 * 日历类属性（语言包，可自由扩展）
 */
Calendar.language = {
  "year": [[""], [""]],
  "months": [["一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"],
    ["JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"]
  ],
  "weeks": [["日", "一", "二", "三", "四", "五", "六"],
    ["SUN", "MON", "TUR", "WED", "THU", "FRI", "SAT"]
  ],
  "clear": [["清空"], ["CLS"]],
  "today": [["今天"], ["TODAY"]],
  "close": [["关闭"], ["CLOSE"]]
}

Calendar.prototype.draw = function() {
  calendar = this;

  var mvAry = [];
  mvAry[mvAry.length] = ' <div name="calendarForm" style="border:1px #9c9c9c solid;border-right:0;border-bottom:0;">';
  mvAry[mvAry.length] = '    <table width="100%" border="0" cellpadding="0" cellspacing="0" style="border:1px solid #999999;border-top-color:#f4f4f4;border-left-color:#f4f4f4;">';
  mvAry[mvAry.length] = '      <tr style="background-color:' + calendar.colors["input_bg"] + ';">';
  mvAry[mvAry.length] = '        <th align="left" width="1%" style="padding:1px;"><input style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:16px;height:19px;margin:0;padding:0;" name="prevMonth" type="button" id="prevMonth" value="&lt;" /></th>';
  mvAry[mvAry.length] = '        <th align="center" nowrap="nowrap" style="padding:1px;"><select name="calendarYear" id="calendarYear" style="font-size:12px;width:56px;margin-right:2px;"></select><select name="calendarMonth" id="calendarMonth" style="font-size:12px;width:66px;"></select></th>';
  mvAry[mvAry.length] = '        <th align="right" width="1%" style="padding:1px;"><input style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:16px;height:19px;margin:0;padding:0;" name="nextMonth" type="button" id="nextMonth" value="&gt;" /></th>';
  mvAry[mvAry.length] = '      </tr>';
  mvAry[mvAry.length] = '    </table>';
  mvAry[mvAry.length] = '    <table id="calendarTable" width="100%" border="0" cellpadding="0" cellspacing="0">';
  mvAry[mvAry.length] = '      <tr>';
  for (var i = 0; i < 7; i++) {
    mvAry[mvAry.length] = '      <th style="font-weight:normal;background-color:' + calendar.colors["tr_bg"] + ';color:' + calendar.colors["tr_word"] + ';border:1px solid #999999;border-top-color:#f4f4f4;border-left-color:#f4f4f4;font-size:12px;width:20px;height:26px;">' + Calendar.language["weeks"][this.lang][i] + '</th>';
  }
  mvAry[mvAry.length] = '      </tr>';
  for (var i = 0; i < 6; i++) {
    mvAry[mvAry.length] = '    <tr align="center">';
    for (var j = 0; j < 7; j++) {
      if (j == 0) {
        mvAry[mvAry.length] = ' <td style="cursor:default;color:' + calendar.colors["sun_word"] + ';border:1px solid #999999;border-top-color:#f4f4f4;border-left-color:#f4f4f4;font-size:11px;font-family:Tahoma;height:20px;"></td>';
      } else if (j == 6) {
        mvAry[mvAry.length] = ' <td style="cursor:default;color:' + calendar.colors["sat_word"] + ';border:1px solid #999999;border-top-color:#f4f4f4;border-left-color:#f4f4f4;font-size:11px;font-family:Tahoma;height:20px;"></td>';
      } else {
        mvAry[mvAry.length] = ' <td style="cursor:default;border:1px solid #999999;border-top-color:#f4f4f4;border-left-color:#f4f4f4;font-size:11px;font-family:Tahoma;height:20px;"></td>';
      }
    }
    mvAry[mvAry.length] = '    </tr>';
  }
  mvAry[mvAry.length] = '      <tr>';
  mvAry[mvAry.length] = '        <th colspan="2"><input name="calendarClear" type="button" id="calendarClear" value="' + Calendar.language["clear"][this.lang] + '" style="border:1px solid #999999;border-top-color:#f4f4f4;border-left-color:#f4f4f4;background-color:' + calendar.colors["input_bg"] + ';width:100%;height:19px;font-size:12px;"/></th>';
  mvAry[mvAry.length] = '        <th colspan="3"><input name="calendarToday" type="button" id="calendarToday" value="' + Calendar.language["today"][this.lang] + '" style="border:1px solid #999999;border-top-color:#f4f4f4;border-left-color:#f4f4f4;background-color:' + calendar.colors["input_bg"] + ';width:100%;height:19px;font-size:12px;"/></th>';
  mvAry[mvAry.length] = '        <th colspan="2"><input name="calendarClose" type="button" id="calendarClose" value="' + Calendar.language["close"][this.lang] + '" style="border:1px solid #999999;border-top-color:#f4f4f4;border-left-color:#f4f4f4;background-color:' + calendar.colors["input_bg"] + ';width:100%;height:19px;font-size:12px;"/></th>';
  mvAry[mvAry.length] = '      </tr>';
  mvAry[mvAry.length] = '    </table>';
  mvAry[mvAry.length] = ' </div>';
  this.panel.innerHTML = mvAry.join("");

  var obj = this.getElementById("prevMonth");
  obj.onclick = function() {
    calendar.goPrevMonth(calendar);
  }
  obj.onblur = function() {
    calendar.onblur();
  }
  this.prevMonth = obj;

  obj = this.getElementById("nextMonth");
  obj.onclick = function() {
    calendar.goNextMonth(calendar);
  }
  obj.onblur = function() {
    calendar.onblur();
  }
  this.nextMonth = obj;


  obj = this.getElementById("calendarClear");
  obj.onclick = function() {
    calendar.dateControl.value = "";
    calendar.hide();
  }
  obj.onmouseover = function() {
    this.style.border = '1px solid #fff';
    this.style.borderTopColor = '#9c9c9c';
    this.style.borderLeftColor = '#9c9c9c';
  }
  obj.onmouseout = function() {
    this.style.border = '1px solid #9c9c9c';
    this.style.borderTopColor = '#fff';
    this.style.borderLeftColor = '#fff';
  }
  this.calendarClear = obj;

  obj = this.getElementById("calendarClose");
  obj.onclick = function() {
    calendar.hide();
  }
  obj.onmouseover = function() {
    this.style.border = '1px solid #fff';
    this.style.borderTopColor = '#9c9c9c';
    this.style.borderLeftColor = '#9c9c9c';
  }
  obj.onmouseout = function() {
    this.style.border = '1px solid #9c9c9c';
    this.style.borderTopColor = '#fff';
    this.style.borderLeftColor = '#fff';
  }
  this.calendarClose = obj;

  obj = this.getElementById("calendarYear");
  obj.onchange = function() {
    calendar.update(calendar);
  }
  obj.onblur = function() {
    calendar.onblur();
  }
  this.calendarYear = obj;

  obj = this.getElementById("calendarMonth");
  with (obj) {
    onchange = function() {
      calendar.update(calendar);
    }
    onblur = function() {
      calendar.onblur();
    }
  }
  this.calendarMonth = obj;

  obj = this.getElementById("calendarToday");
  obj.onclick = function() {
    var today = new Date();
    calendar.date = today;
    calendar.year = today.getFullYear();
    calendar.month = today.getMonth();
    calendar.changeSelect();
    calendar.bindData();
    var _temp = today.format(calendar.dateFormatStyle);
    if (calendar.dateControl.value.indexOf(':') != -1)
      _temp += ' ' + calendar.dateControl.value.split(' ')[1];
    calendar.dateControl.value = _temp;
    calendar.hide();
  }
  obj.onmouseover = function() {
    this.style.border = '1px solid #fff';
    this.style.borderTopColor = '#9c9c9c';
    this.style.borderLeftColor = '#9c9c9c';
  }
  obj.onmouseout = function() {
    this.style.border = '1px solid #9c9c9c';
    this.style.borderTopColor = '#fff';
    this.style.borderLeftColor = '#fff';
  }
  this.calendarToday = obj;
}

//年份下拉框绑定数据
Calendar.prototype.bindYear = function() {
  var cy = this.calendarYear;
  cy.length = 0;
  for (var i = this.beginYear; i <= this.endYear; i++)
    cy.options[cy.length] = new Option(i + Calendar.language["year"][this.lang], i);
}

//月份下拉框绑定数据
Calendar.prototype.bindMonth = function() {
  var cm = this.calendarMonth;
  cm.length = 0;
  for (var i = 0; i < 12; i++)
    cm.options[cm.length] = new Option(Calendar.language["months"][this.lang][i], i);
}

//向前一月
Calendar.prototype.goPrevMonth = function(e) {
  if (this.year == this.beginYear && this.month == 0) {
    return;
  }
  this.month--;
  if (this.month == -1) {
    this.year--;
    this.month = 11;
  }
  this.date = new Date(this.year, this.month, 1);
  this.changeSelect();
  this.bindData();
}

//向后一月
Calendar.prototype.goNextMonth = function(e) {
  if (this.year == this.endYear && this.month == 11) {
    return;
  }
  this.month++;
  if (this.month == 12) {
    this.year++;
    this.month = 0;
  }
  this.date = new Date(this.year, this.month, 1);
  this.changeSelect();
  this.bindData();
}

//改变SELECT选中状态
Calendar.prototype.changeSelect = function() {
  var cy = this.calendarYear;
  var cm = this.calendarMonth;
  for (var i = 0; i < cy.length; i++) {
    if (cy.options[i].value == this.date.getFullYear()) {
      cy[i].selected = true;
      break;
    }
  }
  for (var i = 0; i < cm.length; i++) {
    if (cm.options[i].value == this.date.getMonth()) {
      cm[i].selected = true;
      break;
    }
  }
}

//更新年、月
Calendar.prototype.update = function(e) {
  this.year = e.calendarYear.options[e.calendarYear.selectedIndex].value;
  this.month = e.calendarMonth.options[e.calendarMonth.selectedIndex].value;
  this.date = new Date(this.year, this.month, 1);
  this.changeSelect();
  this.bindData();
}

//绑定数据到月视图
Calendar.prototype.bindData = function() {
  var calendar = this;
  var dateArray = this.getMonthViewArray(this.date.getFullYear(), this.date.getMonth());
  var tds = this.getElementById("calendarTable").getElementsByTagName("td");
  for (var i = 0; i < tds.length; i++) {
    tds[i].style.backgroundColor = calendar.colors["td_bg_out"];
    tds[i].onclick = function() {
      return;
    }
    tds[i].onmouseover = function() {
      return;
    }
    tds[i].onmouseout = function() {
      return;
    }
    if (i > dateArray.length - 1)
      break;
    tds[i].innerHTML = dateArray[i];
    if (dateArray[i] != ".") {
      tds[i].onclick = function() {
        if (calendar.dateControl != null) {
          calendar.update(calendar);//add 20120105
          var _temp = new Date(calendar.date.getFullYear(),
                  calendar.date.getMonth(),
                  this.innerHTML).format(calendar.dateFormatStyle);
          if (calendar.dateControl.value.indexOf(':') != -1)
            _temp += ' ' + calendar.dateControl.value.split(' ')[1];
          calendar.dateControl.value = _temp;
        }
        calendar.hide();
      }
      tds[i].onmouseover = function() {
        //this.style.backgroundColor = calendar.colors["td_bg_over"];
        this.style.border = '1px solid #fff';
        this.style.borderTopColor = '#9c9c9c';
        this.style.borderLeftColor = '#9c9c9c';
      }
      tds[i].onmouseout = function() {
        //this.style.backgroundColor = calendar.colors["td_bg_out"];
        this.style.border = '1px solid #9c9c9c';
        this.style.borderTopColor = '#fff';
        this.style.borderLeftColor = '#fff';
      }
      if (new Date().format(calendar.dateFormatStyle) == new Date(calendar.date.getFullYear(),
              calendar.date.getMonth(),
              dateArray[i]).format(calendar.dateFormatStyle)) {
        tds[i].style.backgroundColor = calendar.colors["cur_bg"];
        tds[i].onmouseover = function() {
          this.style.backgroundColor = calendar.colors["td_bg_out"];
          this.style.border = '1px solid #fff';
          this.style.borderTopColor = '#9c9c9c';
          this.style.borderLeftColor = '#9c9c9c';
        }
        tds[i].onmouseout = function() {
          this.style.backgroundColor = calendar.colors["cur_bg"];
          this.style.border = '1px solid #9c9c9c';
          this.style.borderTopColor = '#fff';
          this.style.borderLeftColor = '#fff';
        }
      }//end if

      //设置已被选择的日期单元格背影色
      if (calendar.dateControl != null && calendar.dateControl.value == new Date(calendar.date.getFullYear(),
              calendar.date.getMonth(),
              dateArray[i]).format(calendar.dateFormatStyle)) {
        tds[i].style.backgroundColor = calendar.colors["sel_bg"];
        tds[i].onmouseover = function() {
          this.style.backgroundColor = calendar.colors["td_bg_out"];
          this.style.border = '1px solid #fff';
          this.style.borderTopColor = '#9c9c9c';
          this.style.borderLeftColor = '#9c9c9c';
        }
        tds[i].onmouseout = function() {
          this.style.backgroundColor = calendar.colors["sel_bg"];
          this.style.border = '1px solid #9c9c9c';
          this.style.borderTopColor = '#fff';
          this.style.borderLeftColor = '#fff';
        }
      }
    }
  }
}

//根据年、月得到月视图数据(数组形式)
Calendar.prototype.getMonthViewArray = function(y, m) {
  var mvArray = [];
  var dayOfFirstDay = new Date(y, m, 1).getDay();
  var daysOfMonth = new Date(y, m + 1, 0).getDate();
  for (var i = 0; i < 42; i++) {
    mvArray[i] = ".";
  }
  for (var i = 0; i < daysOfMonth; i++) {
    mvArray[i + dayOfFirstDay] = i + 1;
  }
  return mvArray;
}

//扩展 document.getElementById(id) 多浏览器兼容性 from meizz tree source
Calendar.prototype.getElementById = function(id) {
  if (typeof (id) != "string" || id == "")
    return null;
  if (document.getElementById)
    return document.getElementById(id);
  if (document.all)
    return document.all(id);
  try {
    return eval(id);
  } catch (e) {
    return null;
  }
}

//扩展 object.getElementsByTagName(tagName)
Calendar.prototype.getElementsByTagName = function(object, tagName) {
  if (document.getElementsByTagName)
    return document.getElementsByTagName(tagName);
  if (document.all)
    return document.all.tags(tagName);
}

//取得HTML控件绝对位置
Calendar.prototype.getAbsPoint = function(e) {
  var x = e.offsetLeft;
  var y = e.offsetTop;
  while (e = e.offsetParent) {
    x += e.offsetLeft;
    y += e.offsetTop;
  }
  return {
    "x": x,
    "y": y
  };
//	var _rect = e.getBoundingClientRect();
//	return { x : _rect.left, y : _rect.top };
}

//显示日历
Calendar.prototype.show = function(dateObj, popControl) {
  if (dateObj == null) {
    throw new Error("arguments[0] is necessary")
  }
  this.dateControl = dateObj;

  this.date = (dateObj.value.length > 0) ? new Date(dateObj.value.toDate(this.dateFormatStyle)) : new Date();//若为空则显示当前月份
  this.year = this.date.getFullYear();
  this.month = this.date.getMonth();
  this.changeSelect();
  this.bindData();
  if (popControl == null) {
    popControl = dateObj;
  }
  //老方法，当空间在带滚动条的div中时会有视觉错位
//	var xy = this.getAbsPoint(popControl);
//	this.panel.style.left = xy.x -25 + "px";
//	this.panel.style.top = (xy.y + dateObj.offsetHeight) + "px";
  var _rect = popControl.getBoundingClientRect();
  this.panel.style.left = _rect.left - 25 + "px";
  this.panel.style.top = (_rect.top + dateObj.offsetHeight) + "px";

  this.panel.style.display = "";
  this.container.style.display = "";

  dateObj.onblur = function() {
    calendar.onblur();
  }
  this.container.onmouseover = function() {
    isFocus = true;
  }
  this.container.onmouseout = function() {
    isFocus = false;
  }
}

//隐藏日历
Calendar.prototype.hide = function() {
  this.panel.style.display = "none";
  this.container.style.display = "none";
  isFocus = false;
}

//焦点转移时隐藏日历
Calendar.prototype.onblur = function() {
  if (!isFocus) {
    this.hide();
  }
}
document.write('<div id="calendar_panel_wrap" style="display:none;"><div id="calendarPanel" style="position:absolute;display:none;z-index:9999;');
document.write('background-color:white;width:175px;font-size:12px;margin-left:25px;"></div>');
if (document.all) {
  document.write('<iframe style="position:absolute;z-index:9000;width:expression(this.previousSibling.offsetWidth);');
  document.write('height:expression(this.previousSibling.offsetHeight);');
  document.write('filter:alpha(opacity=0);-moz-opacity:0;opacity:0;');
  document.write('left:expression(this.previousSibling.offsetLeft);top:expression(this.previousSibling.offsetTop);');
  document.write('display:expression(this.previousSibling.style.display);" scrolling="no" frameborder="no"></iframe>');
}
document.write('</div>');
